Therapy
Radiation therapy
Radiation therapy uses high-powered beams of energy, such as X-rays, to kill cancer cells. Radiation therapy is typically done using a large machine that aims the energy beams at your body (external beam radiation). But radiation can also be done by placing radioactive material inside your body (brachytherapy).
External beam radiation is commonly used after lumpectomy for early-stage breast cancer. Doctors may also recommend radiation therapy after mastectomy for larger breast cancers.
Side effects of radiation therapy include fatigue and a red, sunburn-like rash where the radiation is aimed. Breast tissue may also appear swollen or more firm. Rarely, more serious problems may occur, including arm swelling (lymphedema), broken ribs and damage to the lungs or nerves.
Chemotherapy
Chemotherapy uses drugs to destroy cancer cells. If your cancer has a high chance of returning or spreading to another part of your body, your doctor may recommend chemotherapy after surgery to decrease the chance that the cancer will recur. This is known as adjuvant systemic chemotherapy.
Chemotherapy is sometimes given before surgery in women with larger breast tumors. Doctors call this neoadjuvant chemotherapy. The goal is to shrink a tumor to a size that makes it easier to remove with surgery. This may also increase the chance of a cure. Research is ongoing into neoadjuvant chemotherapy to determine who may benefit from this treatment.
Chemotherapy is also used in women whose cancer has already spread to other parts of the body. Chemotherapy may be recommended to try to control the cancer and decrease any symptoms the cancer is causing.
Chemotherapy side effects depend on the drugs you receive. Common side effects include hair loss, nausea, vomiting, fever and frequent infections.
Hormone therapy
Hormone therapy — perhaps more properly termed hormone blocking therapy — is often used to treat breast cancers that are sensitive to hormones. Doctors sometimes refer to these cancers as estrogen and progesterone receptor positive cancers.
Hormone therapy can be used after surgery or other treatments to decrease the chance of your cancer returning. If the cancer has already spread, hormone therapy may shrink and control it.
Treatments that can be used in hormone therapy include:
- Medications that block hormones from attaching to cancer cells. Tamoxifen is a type of drug called a selective estrogen receptor modulator (SERM). SERMs act by blocking any estrogen present in the body from attaching to the estrogen receptor on the cancer cells, slowing the growth of tumors and killing tumor cells. Tamoxifen can be used in both pre- and postmenopausal women.
- Medications that stop the body from making estrogen after menopause. Called aromatase inhibitors, these drugs block the action of an enzyme that converts androgens in the body into estrogen. These drugs are effective only in postmenopausal women. Aromatase inhibitors include anastrozole (Arimidex), letrozole (Femara) and exemestane (Aromasin).
- Surgery or medications to stop hormone production in the ovaries. In premenopausal women, surgery or medications can shutdown hormone production in the ovaries.
Side effects of hormone therapy vary according to which medication you receive, but typically include menopausal symptoms, such as hot flashes, vaginal dryness, decreased sex drive and mood changes. Side effects of aromatase inhibitors include joint and muscle pain, as well as an increased risk of bone thinning (osteoporosis).